gpg: New option --list-filter
* g10/gpg.c (oListFilter): New. (opts): Add --list-filter. (main): Parse oListFilter. * g10/keylist.c: Include init.h and recsel.h. (struct list_filter_s, list_filter): New. (release_list_filter): New. (cleanup_keylist_globals): New. (parse_and_set_list_filter): New. (list_keyblock): Implement --list-filter type "select". * g10/import.c (impex_filter_getval): Add scope support and new property names "key-size", "algostr", "origin", "lastupd", and "url".
This option is pretty useful to select keys based on their properties.
The scope thing can be sued to limit a selection to just the primary
key or to subkeys. For example:
gpg -k --list-filter 'select=revoked-f && sub/algostr=ed25519'
Lists all non-revoked keys with an ed25519 (signing)-subkey.